Introducing the Deprecation Toolkit - Shopify

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Introduced the open-source Deprecation Toolkit, a Ruby gem designed to manage code deprecations. The toolkit uses a whitelist approach to track acceptable deprecations by recording them during test runs. It then compares subsequent deprecation triggers against this whitelist, raising errors for new or removed deprecations by default. This allows for gradual fixing of existing deprecations while preventing the introduction of new ones, facilitating dependency upgrades and improving codebase health.